#include"string.h"
namespace yue
{
	void text1()
	{
		string s1 = ("yuejianhua");
		s1.erase(3,4);
		s1.insert(3,'l');
		cout << s1;
	}
	void text2()
	{
		string s2 = ("hello world hello bit yuejianhua");
		string s3= s2.substr(0, 10);
		cout << s3 << endl;
	}
}
int main()
{
	yue::text2();
	return 0;
}